David Starkey is well known within the field of history, and much lampooned for his delivery on satrical shows like Dead Ringers. However, he hits his stride both here, and in the following documentary Elizabeth.
I'd recommend that his books act as the perfect companion to, if you want to view it this way, as the movie version of the story of Henry VIII. A turbulent King, who shakes up the nature of the country never to be the same again, and driven by the lack of a successor to the throne, goes through several wives, before eventually becoming driven by greed and vice.
As a ex-A Level student of the Tudor period, I originally came to the series as revision for my study. Not only is it essential viewing for anyone studying the period for history, it is probably the definitive study of Henry VIII in visual form. The re-enactment of Tudor times serves as background to Starkey's detailed and enlightening anaylsis.
DVD extras are few sadly, but a commentary would defy the point, and the clearance rights on including any other documentaries on Henry VII would serve to detract from the quality of this product. Perhaps as an extension to this four part documentary is the "Burning Convictions" episode of A History Of Britain by Simon Schama, which shows the consequence of Henry's upturning of the church